id:A049692 - OEIS Search Results

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(divisors(n))^2 does not divide sum of divisors of n.

+0
2

2, 4, 5, 6, 8, 9, 10, 12, 13, 14, 15, 16, 17, 18, 20, 22, 24, 25, 26, 27, 28, 29, 30, 32, 34, 36, 37, 38, 39, 40, 41, 42, 44, 45, 46, 48, 49, 50, 51, 52, 53, 54, 55, 56, 58, 60, 61, 63, 64, 65, 66, 68, 70, 72, 73, 74, 75, 76, 78, 80, 81, 82, 84, 85, 86 (list; graph; listen)

	OFFSET	`1,1`
	REFERENCES	`Handbook of Number Theory, D. S. Mitrinovic et al., Kluwer, Section III.51.`
	MAPLE	`with(numtheory): t := [ ]: f := [ ]: for n from 1 to 500 do if sigma(n) mod sigma[ 0 ](n)^2 = 0 then t := [ op(t), n ] else f := [ op(f), n ]; fi; od: f;`
	CROSSREFS	`Cf. A003601, A049642, A049645.` `Adjacent sequences: A049689 A049690 A049691 this_sequence A049693 A049694 A049695` `Sequence in context: A141204 A096997 A081694 this_sequence A047839 A139255 A004773`
	KEYWORD	`nonn`
	AUTHOR	`njas`

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.

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